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Use the relationship between the sine and cosine functions to fill in each blank.

Use the relationship between the sine and cosine functions to fill in each blank.-example-1
User Shih
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Answer:

1. sin 70° = cos (90° - 70°)

2. cos 84° = sin (90° - 84°)

3.cos 88° = sin (90° - 88°)

4. sin 12° = cos (90°-12°)-------------sin 12° = cos (78°)

5.cos 78° = sin (90° - 78°)----------------cos 78° = sin 12°

6. sin 60° = cos (90° - 60°)-------------------sin 60° = cos (30°)

7. sin (90° - 26°) = cos 35°

8.cos (48° - 30°) = sin 72°

9.cos (90° - 41°) = sin 41°

10. sin 9° = cos (90°-9°)-------------------sin 9° = cos 81°

11. sin 89° = cos (90°-89°)------------------------sin 89° = cos 1°

12.cos 15° = sin (90° - 15°)

13.cos (39°-23°) = sin 74°

14. sin 4° = cos (90°-)

15. sin 5° = cos (90°-5°)---------------------------sin 5° = cos 85°

Explanation:

You need to use the trigonometric ratios which states that:

sin α = cos (90° - α)

cos α = sin (90° - α)

User ManyQuestions
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